diff --git a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer
index 11599a1bc..5f444a0b0 100755
Binary files a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer and b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer differ
diff --git a/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
index 0ade6d222..05bd2df8e 100644
--- a/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
@@ -1149,7 +1149,7 @@ int checkVLimitCompliant(int mV) {
 }
 
 int checkVLimitDacCompliant(int dac) {
-    if (vLimit > 0) {
+    if (vLimit > 0 && dac != -1 && dac != LTC2620_GetPowerDownValue()) {
         int mv = 0;
         // could not convert
         if (LTC2620_DacToVoltage(dac, &mv) == FAIL)
diff --git a/slsSupportLib/include/sls/versionAPI.h b/slsSupportLib/include/sls/versionAPI.h
index e5e3c55bf..00f22cf28 100644
--- a/slsSupportLib/include/sls/versionAPI.h
+++ b/slsSupportLib/include/sls/versionAPI.h
@@ -4,10 +4,10 @@
 #define RELEASE      "developer"
 #define APILIB       "developer 0x230224"
 #define APIRECEIVER  "developer 0x230224"
-#define APICTB       "developer 0x230525"
 #define APIGOTTHARD  "developer 0x230525"
 #define APIGOTTHARD2 "developer 0x230525"
 #define APIMYTHEN3   "developer 0x230525"
 #define APIMOENCH    "developer 0x230525"
 #define APIEIGER     "developer 0x230525"
 #define APIJUNGFRAU  "developer 0x230525"
+#define APICTB       "developer 0x230605"